I'm supposed to be painting inside my house but I did another test
This time I ran my 11,500 BTU Air Conditioner in Heat Pump mode. (too cold up here for cooling) No problem at all, still in econo mode.
While the heat pump was running I ran the microwave on high. No problem, still in econo mode.
The battery charger in my RV was running also but, as my batteries were already charged, it wouldn't have drawn much.
I might have been using 2600 watts for this test.
With my $15 digital multimeter I measured the outlets - 118 volts in econo-mode with no load. With econo-mode off I measured 117.5 volts again with no load.
Both the 30 amp outlet and the 20 amp outlet measured the same voltage.
That's it for my tests - I better get busy painting.